Process of winding and cutting paper into sizes



PAPER was FROM PAPER MAM/vs MACHINE Jan. 5, 1937.

E. H. JANSON' ET AL PROCESS OF WINDING AND CUTTING PAPER INTO SIZESFiled April 30, 1955 BEL DRIVE GREEN PAPER I I YELLOW PAPER YELLOW PAPERPatented Jan. 5, 1937 UNITED STATES PATENT EQE Einar Henrik Janson,Amotfors, and Johan Olof Nauclr, Stockholm, Sweden Application April 30,

1935, Serial No. 19,042

In Sweden May 1, 1934 Claims.

Our invention relates to an improved process for cutting paper intosizes, in which the lot of paper to be cut is composed of a plurality ofdifferent kinds of paper. As to the difference of 5 the various papersto be cut, this may consist in difference as to quality, weight, colouror any other fact of distinction.

As is well known in the paper-making art, paper-making machines producepaper in a continuous sheet which is customarily wound into rolls onsuitable cores. While some paper is sold by the roll, a great deal issold in sheet form cut to specified sizes. In the ordinary course ofbusiness, a' paper mill may have to fill orders for paper involving awide variety of colors, sizes and qualities. In filling such orders,rolls of paper are mounted in the supply frame of a cutting machine, thepaper for such rolls being fed to the machine to be cut into sheets ofpredetermined size. As the cutting machines are in general capable ofcutting a plurality of sheets simultaneously, it is evidently desirable,for economical operation, to utilize the maximum cutting capacity of themachine. In filling miscellaneous 2 orders, particularly small ordersfor difierent kinds of paper, it has heretofore frequently beennecessary to operate the cutting machine at considerably less than itsmaximum capacity. Otherwise, it would be, necessary to make many extra 5roll changes, which is time consuming and therefore objectionable.

The present invention has for its object to enable a better utilizing ofthe capacity of the cutting machine, especially in the case of cuttingof smaller lots of paper of different kinds, and to lower the percentageof waste, which otherwise in the case of cutting of small lots willgenerally become very high, as well as in general to reduce the cuttingcosts.

We have discovered that when each of the various kinds of paper to becut, in the winding previous to the cutting operation, is distributedequally among a number of cores equal to the maximum number which can beaccommodated by the cutting machine, or a multiple thereof, the windingbeing carried out so that on the several cores the various kinds ofpaper follow each other in similar quantities and order of succession, agreat saving in time, costs, and handling labor is effected.

The winding may suitably be made either directly in the paper machine,or as the paper is leaving said machine or in special winding machinesprovided for this purpose.

Assuming for instance the lo o aper to be (Cl. 16 l-17) cut at one timeto consist of three different types, e. g. green, yellow, and red paper,it may, for instance, be started by winding the green paper innermost,in each roll, then red paper outside of this and finally yellow paper ontop. Of each quality the same length is suitably wound on each roll e.g. first 300 meters of green, then 400 meters of red, and finally 500meters of yellow paper on each roll. The length of each kind of paper inthe rolls is suitably chosen such, that the total number of rolls onwhich the whole lot is wound will be slightly less or equal to an evenmultiple of the maximum number which can be accommodated in the cuttingmachine. The capacity of this latter will in this way be completelyutilized. In the accompanying drawing Fig. 1 is a transverse sectionalview of twelve rolls distributed on four supporting frames a to dbelonging to a cutting machine designed to cut twelve sheetssimultaneously. The cutting machine is not'shown, as the construction ofthis machine does not relate in any way to the invention. In each roll,the three equal lots of green, red and yellow paper are wound andclearly marked. The yellow paper is shown as being led to the cuttingmachine to be cut into size, and as all frames belonging to the machineare filled, twelve layers of paper are simultaneously cut, thus, thecutting machine is completely utilized.

The different kinds of paper will thus, in this manner each be cutseparately, without making it necessary to change the rolls in thecutting machine frames until the different qualities contained in thelot have all been cut. Figure 2 illustrates the method by which therolls may be wound. A number of rolls are shown consisting of cores uponwhich have been wound equal quantities of green paper, then equalquantities of red paper. Yellow paper from a paper-making machine isbeing wound on one of the rolls. When the winding of a predeterminedamount of yellow paper on this roll has been completed, the other rollswill receive in turn similar amounts of yellow paper, whereupon thesetof rolls will be ready to be mounted on the support frames a to d ofthe cutting machine. When loading the rolls, the different kinds ofpaper contained on each roll may be affixed to each other by a suitablemeans. The roll onto which paper is directly wound in a paper machine,is driven by suitable means, such as a friction gear, in order tosecure, during loading of the roll, a speed of rotation corresponding tothe speed of the paper machine delivering paper to said roll. It isobvious that these details are not essentials of the invention and,therefore, not specifically illustrated in the drawing. Furthermore, itmay often be very useful to provide an automatic alarm device or thelike to indicate when a desired quantity of paper has been wound ontothe roll.

It is evident that each roll before being completely wound, for instancein a paper machine, must be changed three times during the windingoperation. To facilitate this changing as much as possible, the smallestquantity of paper may for instance be Wound innermost in each roll, thenthe quantity next in size, and so forth. Thus the rolls will have theleast possible weight at the end of each winding step, whereby they arerendered more easy to manipulate e. g. when being shifted in the paperor winding machine respectively.

If substantially equal lengths of different kinds of paper are to bewound on the rolls, that kind having the highest gramweight per squaremeter should preferably be wound innermost on the rolls, since theselatter in this way will be given the highest degree of firmness.

We have discovered that as much as 25 different kinds of paper may inthis way be wound onto and cut from the same roll.

The described process is of great advantage in comparison to thosepreviously used in the art. Thus, the capacity of the cutting machine isincreased, partly because of the time for shifting the rolls in the samebeing reduced to a minimum, thereby rendering the effective cuttingperiod of the machine longer, and partly because of the fact that agreater number of rolls may be inserted in the machine. than hasheretofore been possible especially in the case of cutting smaller lots.

When working according to methods heretofore used, it has been necessaryto shift the rolls the same number of times in the cutting machine as e.g. in the paper machine, while, when working according to the presentinvention, the number of times for exchanging rolls in the cuttingmachine may be reduced by a number equal to the number of differentkinds of paper in the rolls, without having to increase the number ofexchanges of rolls in the paper machine. The total number ofroll-changes when working with two different kinds of paper in each rollwill thus be reduced by 25%, when using three different kinds by 33.3%,and so forth.

The possibility of winding several different kinds of paper on the sameroll will furthermore bring about a lowering of the so called cuttingpercentage due to the fact that the amount of waste which is produced bythe small diameter of the core on which the paper is wound may beconsiderably reduced as a consequence of the possibility for making eachroll bigger and the number of rolls smaller than heretofore has beenpossible.

By reducing the number of rolls it is also possible to considerablyreduce the stock of cores which is otherwise required. In cutting ofsmaller lots into sheets it is thus possible to reduce the number ofcores inversely as the number of kinds of paper in each roll.

The wear on the cores as well as of the cutting machines will alsobecome reduced thanks to the less frequent exchange of cores.

The necessity for using so called auxiliary winding stands during thecutting is also reduced,

whereby the use of cheaper and simpler types of cutting machines isrendered possible and advantageous. The number of operators necessaryfor the cutting is also reduced in this manner. It is thus seen that thepresent invention will in many ways render the winding and cuttingoperations easier and less expensive. In the cutting of smallerquantities it has, for instance, been possible to reduce the cuttingcosts as much as 50%.

It is obvious that the paper webs wound onto a roll in accordance withour invention do not necessarily have to be equal as to breadth. In thecase of handling paper of different breadth, however, it was founduseful to wind the broader webs innermost in the roll. It isfurthermore, to be noted that in cases where different kinds of paperare successively produced by one and the same paper making machine, themethod according to our invention will be applied in such manner thatall orders of one kind of paper are produced without interruption butWound on different rolls and each roll loaded with the quantity of papercorresponding to a single order. By this, the paper machine will firstbe stopped when all orders for that kind of paper are disposed of, therolls, however, are changed at least as often as orders for that specialkind of paper have to be filled.

It is evident that the invention is not limited to winding and cuttingof materials which are commonly understood as paper but may be usefulfor all kinds of sheet material which can be stocked and thereaftertreated in a manner similar to the processes disclosed by the presentspecification. Thus, all matter contained in the above description orshown in the accompanying drawing is not to be interpreted in a limitingsense. The following claims are intended to cover all of the generic andspecific features of the present invention.

Having described our invention what we claim is:

1. In a process of cutting paper of different kinds into sizes, whichcomprises winding paper on rolls, the steps of winding in successionpaper of different kinds on a roll, feeding a paper cutting machine withthe stock of paper thus contained on said roll, and cutting said paperinto sizes in inverse succession to the initial winding of the paper onthe roll.

2. A process of cutting paper into sizes which comprises provision ofstocks of paper of different kind, winding paper from said stocks onto aplurality of rolls successively loading each of said rolls with an equalnumber and an equal quantity of said kinds of paper in a successionwhich is the same for all rolls feeding a cutting machine with the paperon said rolls, and cutting said paper into sizes in inverse successionto the initial winding onto said rolls.

3. In a process of cutting paper of different kinds into sizes, thesteps of winding paper of different kinds onto a plurality of rolls,loading each of said rolls in succession with an equal number and equalquantity of said kinds of paper in a succession which is the same forall rolls, the total number of the loaded rolls being equal to or aneven multiple of the maximum number of rolls which can be inserted in acutting machine, feeding said cutting machine with the paper on saidrolls, and cutting said paper into sizes in inverse succession to theinitial winding onto said rolls.

4. In a process of cutting paper which comprises provision of stocks ofpaper of different kinds, the steps of winding paper of different kindsonto a number of rolls equal to or an even multiple of the maximumnumber of rolls which can be inserted in a cutting machine, winding onall of said rolls to be loaded an equal number and quantity of saidkinds of paper from said stocks in succession, feeding said cuttingmachine with the paper on said rolls, and cutting said paper into sizesin inverse succession to the initial winding onto said rolls.

5. A process for cutting lots of different kinds of paper to size on amachine capable of sient kinds of paper are cut to size in inverse se-10 quence to the initial winding onto the rolls.

EINAR HENRIK JANSON. JOHAN 01.05 NAUCLER.

